Hoeace johnson



HpJOHNSON.

Try-Square.

No. 226,075 Patented'Mar. 30, 1880.

MPETERS, PHOTO-LITHOGRAPNEIL WASHINGTQIQ. l7v C.

llNrrn STATES HORACE JOHNSON, OF CRITTENDEN, NEW YORK.

TRY-SQUARE.

SPECIFICATION forming part of Letters Patent No. 226,075, dated. March 30, 1880.

Application filed December 29, 1879.

To all whom it may concern:

Be it known that I, HORACE JOHNSON, of Orittenden, in the county of Erie and State of New York, have made certain Improvements in Try-Squares, of which the following is a Specification.

The object of this invention is to present a single adjustable try-square that will take the place of two or more of different sizes by Varying the length of the blade or measuringarm in this, so as to fit it to indicate correctly or measure long or short spaces to be squared or marked off, or for other uses that trysquares are put to; and the invention consists in its construction, all as hereinafter fully explained.

In the drawings, Figure 1 is a plan, partly in section; Fig. 2, detail of the screw-rod.

A represents the handle or base-piece of the try-square, having a central hole, (6, throughout its length, for the screw-holding rod 1) to set therein.

The upper part of the piece A is bifurcated at f sufficiently to set in the blade B, as shown, and has a long slot, 0, through the middle.

The upper part of the rod 1) is constructed with two slits or openings, dd, one above and one below, and below that, for a short distance, is a flat space, e. In these openings 61 the upper and lower divisions of the blade B set, and are there held by the part I), but at the same time permit the blade to slide right and left, but without allowing it to be released from the rod.

The slit f is made so as to always hold the blade squarely therein.

The lower end of the rod Z) is screw-threaded, with a thumb-nut, g, thereon. When it is desired to move the blade either way it is unscrewed a little and the blade slid along to the point desired, and the thumb-nut is then the blade firmly against the seat of the slit f,

holding it there until released for a different adjustment of length of blade.

The blade may be marked in inches or other divisions, if desired, so as to be used in measuring as well as squaring.

The disadvantage of the ordinary try-square is, that the blade is usually too long, and where molding or beading or ridges are on the part to be squared the blade is in the way and has to lie on the stuff at a slant, at times preventing the user getting a correct squaring, or else two or more different sizes of try-squares have to be employed. Mine will answer for two or three, as a long or short arm can be made of the blade, and one side be long and the other short, if desired. The open slit or space a is also an advantage, as the pencil to mark off the true lines can be used inside as well as outside the blade. The cost is only a trifle more than the ordinary squares.

I claim- In a try-square, the slotted blade B c, the bifurcated handle A f, and central hole, a, and the holding and adjusting rod 11 b d d c, and nut g, all constructed and operating substantially as and for the purpose specified.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

HORACE JOHNSON.

Witnesses:

P. TAHANEY, L. M. SADLER. 

